#!/bin/bash
#
# "dpkg" and "apt-get" wrapper for scratchbox 2:
# All mapping modes are not compatible with all operations that Debian
# package management tools can do; for example, packages must not be
# installed in the "maemo" mode which has been designed for compiling packages.
# This wrapper first checks if the operation is permitted, and executes the
# real tool only if it hasn't been denied by SB2's configuration.
#
# Following tools and operations are controlled here:
# - "dpkg": "-i" and "--install" can be disabled
# - "apt-get": "install" and "upgrade" can be disabled
#
# Copyright (c) 2008 Nokia Corporation.
# All rights reserved.
# Author: Lauri T. Aarnio
#
# Licensed under GPL version 2

args="$*"
prog="$0"
progbase=`basename $0`

function error_not_inside_sb2()
{
	echo "SB2: $progbase wrapper: This wrapper can only be used from inside"
	echo "the scratchbox 2'ed environment"
	exit 1
}

if [ -z "$SBOX_SESSION_DIR" ]
then
	error_not_inside_sb2
fi

. $SBOX_SESSION_DIR/sb2-session.conf

if [ -z "$sbox_mapmode" -o -z "$sbox_dir" ]
then
	error_not_inside_sb2
fi

# read-in mode-specific settings
if [ -f $SBOX_SESSION_DIR/modes/$sbox_mapmode/sb2rc ]
then
	. $SBOX_SESSION_DIR/modes/$sbox_mapmode/sb2rc "$progbase"
fi

function deny_operation()
{
	echo "SB2: $progbase wrapper: Operation denied in this mode ($sbox_mapmode)"
	echo "SB2: $progbase wrapper: You need to use another mode for installing and"
	echo "SB2: $progbase wrapper: removing packages (typically the 'emulate' mode will do)"
	exit 1
}

case "$progbase" in
(dpkg)
	realtool=/usr/bin/dpkg
	if [ -n "$SBOX_DPKG_WRAPPER_DENY_INSTALL" ]
	then
		for i in $args
		do
			case "$i" in
			(-i|--install|-r|--remove)
				deny_operation
				;;
			esac
		done
	fi
	case "$1" in
	--print-architecture)
		if [ -n "$DEB_HOST_ARCH" ]; then
			echo "$DEB_HOST_ARCH"
			exit 0
		fi
		;;
	esac
	;;
(apt-get)
	realtool=/usr/bin/apt-get
	if [ -n "$SBOX_APT_GET_WRAPPER_DENY_INSTALL" ]
	then
		for i in $args
		do
			case "$i" in
			(install|upgrade|remove)
				deny_operation
				exit 1
				;;
			esac
		done
	fi
	;;
(*)
	echo "SB2: $progbase wrapper: FATAL ERROR: don't know where to find real $progbase"
	exit 1
	;;
esac

# Default: Ok to execute the real tool
exec $realtool $args
